C2: Word Problems

Question 1

two thirds of a number means

Answer 1

2/3x (“of” means multiply)

Question 2

5 decreased by a number

Answer 2

5-x (not x-5)

Question 3

3 more than twice a number

Answer 3

2x + 3

Question 4

twice the sum of a number and 3

Answer 4

2(x+3)

Question 5

7 less than 3 times a number

Answer 5

3x-7

Question 6

7 decreased by 3 times a number

Answer 6

7-3x

Question 7

the square of one more than a number

Answer 7

(x+1)^2

Question 8

one more than the square of a number

Answer 8

x^2 +1

Question 9

two consecutive integers

Answer 9

n and n+1

Question 10

the sum of three consecutive integers

Answer 10

n + (n+1) + (n+2)

Question 11

8 more than four times the cube of a number

Answer 11

4x^3 +8

Question 12

what is the formula for percent change?

Answer 12

percent change= (difference/ original) *100

Question 13

what does an average pie look like?

Answer 13

total/ # of things * average

Question 14

what does a rate pie look like?

Answer 14

total/ time * rate

Question 15

what formula do you use in a group question that asks for “both” groups?

Answer 15

total= group 1 + group 2 - both + neither